Macoui

Macoui Marine weather, offline charts & routing

Macoui is a marine weather and isochrone routing application designed by a sailor for real-world use at sea.

Built for offshore sailing, long-distance cruising, and low-connectivity environments, Macoui focuses on clarity, simplicity, and true offline operation.

Clear and practical marine weather

- Fast, readable marine weather visualization

- Simple map-based interface inspired by proven navigation tools

- Side-by-side use of multiple weather models to support decision-making

Available weather models:

- ECMWF

- GFS 0.25°

- GFS 0.50°

- ICON

- ICON-EU

- COPERNICUS CURRENT

- AROME

- ARPEGE

- GFS WAVES

Offline nautical charts with MBTiles

- Import and read MBTiles files directly in Macoui

- Display your own offline chart layers on the map

- Keep key cartographic data available when sailing with limited or no connectivity

Isochrone routing for offshore sailing

- Weather-based route calculation

- Designed for ocean passages and long crossings

- Routing as a decision-support tool, not an automated pilot

The navigator remains in control at all times.

True offline mode

- Download GRIB files in advance

- Use weather, routing, and offline chart layers without internet access

- Reliable use offshore and in remote areas

Local cache management ensures continued operation even when connectivity is lost.

Multiplatform and onboard-friendly

- Works on phones, tablets, and computers

- Optimized interface for onboard use

Macoui is currently in beta:

- Some features are still evolving

- Occasional bugs may occur

- User feedback is essential to improve the application

Project philosophy

- Free to use

- Offline-first

- No cloud dependency for core onboard use

- Designed with safety, redundancy, and simplicity in mind

Macoui does not aim to replace existing navigation tools, but to offer a modern, lightweight, and accessible alternative for marine weather analysis, offline chart viewing, and routing.

Tutorials and documentation:

https://macoui.app